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Blackbacked Butterflyfish Video Stock Footage
This fish grows up to 18 cm (c. 7 in) long, and may live for up to 20 years. When observed at night or when frightened, this species changes color the dorsal portion of the body turns black except for two white patches. It belongs to the large subgenus Rabdophorus which might warrant recognition as a distinct genus. In this group, it appears a close relative of the Spot-tailed Butterflyfish (C. ocellicaudus) and somewhat less close to the Yellow-dotted Butterflyfish (C. selene). These are all of oval shape, silvery with yellow fins and snout, ascending diagonal stripes, and black markings around the eyes, on the caudal peduncle, and sometimes on the back. Next closest seem the Saddle Butterflyfish (C. ephippium) and the Dotted Butterflyfish (C. semeion), but these are already so distant that their ancestors must have diverged from those soon after the Rabdophorus lineage started to diversify.
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